[rabbitmq-discuss] For speed, use Shovel or not?

[ristretto.rb]

Hi Rabbiteers,

Suppose there are two servers connected across a WAN (read internet),
sending transient messages, with all else held constant what is the
faster method in terms of messages / sec:  Two brokers and a Shovel,
one broker with a remote publisher, or one broker with a remote
consumer.  (The last two cases might be really just one case.)

msg -> X -> Q -> Shovel -> X -> Q -> Consume
vs
msg ---------------------------> X -> Q -> Consume

What if durability is required?  Does this change the decision?

Thanks
Gene